Riveting machine



jufiy 15. 192%, 1,501,421

E. B. STIMPSON RIVETING MACHINE Filed July 19, 1922 %ORNEY Patented July 15, 1924.

r i FBST'ATE EDWIN B. STIMPSON, OF'ZBRDOK-LYZN, NEW

YORK, ASSIGNO'R TD EDWIN B. STIIVIPSO COMPANY, OF BROOKLYN, NEW YORK.

RIVETING Application filed July 19,

T all whom it may concern:

Be it known that I, EDWIN B. STIMPsoN,

a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in R-iveting Machines, of which the following is a specification.

This invention relates particularly to riveting machines of the type in which the rivets slide down an incline onto a guide beneath the driving plunger. Upon striking this guide there is a tendency for the rivets to rebound and get out of position.

Th principal objects of the invention are to prevent this rebound and to overcome the so-called tumbling tendency of the rivets.

The novel features of construction and combinations of parts which make possible the attainment of these objects ar exemplified in the accompanying illustrations forming part of this specification.

Figure 1 is a broken front view of the head portion of a riveting machine having the invention incorporated therein, with the front or near section of the rivet guide omitted to better disclos the relation of the parts.

Figure 2 is a horizontal sectional view on substantially the plane of line 22 of Figure 1.

Figure 3 is a detached perspective view of the rivet driving plunger.

The head portion of a riveting machine is indicated at 1 having the usual driving spindle 2 and rivet feeding mechanism at 3 terminating in an inclined chute or guideway 4:.

At the foot of the chute, beneath the plunger, is the guide for directing the rivets during the driving operation, which is shown as consisting of cooperating guide members or sections 5, 6 supported from the slide 7 by the spring arms 8 and 9. These cooperating guide members are shown as removably and adjustably supported by means of the holding screw 10 and wing nut 11.

The rivet guide forms in effect a pocket at the foot of the guide chute to catch and hold the rivets in position to be acted upon by the plunger.

()verstanding the pocket provided by the rivet guide is a hold-down device shown in plunger is down in position, blocking the MACHINE.

1922. Serial No. 575,946.

the form of a narrow finger projecting from the upper side of the guide chute on an incline down substantially over the center of the pocket and terminating at a point closely adjacent the head of a rivet sea-ted in'the pocket. The extreme end of this guide finger is shown as faced off substantially horizontal so as to permit the rivet to slide squarely intoposition beneath the same. The driving plunger is shown as constructed with a removable end section 13 having a reduced portion 14: fitting in a socket 15 in the body of the plunger and held in place by a set screw 16. This removable section is grooved in one side at 17 to pass over the projecting hold-down finger 12 and is shown as cupped at 18 to fit the head of the rivet.

A special feature of the invention is the utilization of the plunger to assist in holding the rivets under proper control. This is effected by releasing one of the rivets at each downward stroke of the plunger, so that the same will lie against the side of the plunger, in readiness to drop into the pocket just so soon as the plunger is retracted. In a preferred operation of the machine, therefore, a feed slide 19 is operated to release the lower rivet when the lower end of the inclined chute 4. The rivet then is ready to slide easily into position on the guides and beneath the end of the hold-down finger the instant the plunger frees the same. In this way the extent of the drop is materially reduced and the rivet comes accurately to rest in the hollow or pocket at the top of the guides. Even with so short a drop, however, there is a tendency for the rivets, particularly those with large heads and short shanks, to rebound and tumble. This effect is overcome in its incipiency-by the hold-down finger which immediately checks any rebound movement and returns the rivet to 100 its proper position on the guides. Thus without restricting the movement of the rivet or delaying the action in any way, the rebounding and tumbling tendencies are effectually overcome.

What I claim is:

In a machine of the character disclosed, a rivet guide having a pocket to receive and support the head of a rivet, rivet feeding means including an inclined chute for 110 delivering the rivets to the pocket, at stationary hold-down finger forming the delivery end of one guide wall of the chute and having a projecting portion inclining 5 downwardly to and terminating at a point substantially over the center of the head of a rivet supported in the pocket, and a plunger for operating on the head of a, rivet so supported, having a groove in one side to receive the projectlng portion of the 10 hold-down finger.

In testimony whereof I afiix my signature.

EDWIN B. STIMPSON. 

